1. I would have cast one actor for Anakin across all 3 movies. Had Anakin closer to Padme's age.
2. Would have maximized Obiwan's role and minimized or eliminated Quigon's role. Maybe Obiwan is the one that debates the jedi council on the training of Anakin, not Quigon.
3. Got rid of all those stupid CGI creatures that were unnecessary. Use more practical effects and animatronics
4. Padme still dies at childbirth. Leia is born, and named. Luke is born, and Padme dies just as he is born and she doesn't name him. That way when we meet Luke in Episodes 4-6, we don't know about Leia being his sister until he reveals it to us in Episode 6.